Zaps are front and centre of every Nostr client, I think this focus is a a turnoff for the average normal person looking for a twitter  alternative.  Few people on earth care much for bitcoin , few understand it many actively distrust it .  But worse still, almost  nobody understands lightning (and lightning is even harder to use / understand than bitcoin). And who wants to switch to a platform they don't understand and lets be honest never will.  Lightning is HARD!